Best chain and 20" bar combination for cs-8000 echo

[Rusty Bluck]

I have a echo cs-8000. It has a 27 in bar with a really aggressive chain. It runs well but I'm wanting to put a 20 in bar and chain.. What would be my best option? The saw has lots of power. And I wanting it to flat out cut!

 

[Rusty Bluck]

My saws